Fix: Rename directory to remove & character causing shell issues

Renamed ebook_backend&admin_panel to ebook_backend_admin_panel
  The & character was being interpreted by shell as background
  process operator, causing 'Dockerfile not found' errors in Coolify.

ebook_backend_admin_panel/admin-backend/pytest.ini

@@ -0,0 +1,12 @@
+[tool:pytest]
+testpaths = tests
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+asyncio_mode = auto
+addopts = -v --tb=short --maxfail=5 --durations=10 --disable-warnings --no-header
+filterwarnings =
+    ignore::DeprecationWarning
+    ignore::PendingDeprecationWarning
+    ignore::UserWarning
+